1 Explain that a population pyramid shows the age and sex structure of a population. 2  Point to the horizontal bars, which show the percentage (or the absolute number) of males and females in each age group. 3  Have students interpret the chart.
1 Although they range from $150-$400 or more, a large capacity (25-70 pints) dehumidifier for a basement (the dampest portion of most homes) or other large area averages $200-$300.
Use a dehumidifier when a room feels damp. Rooms that feel damp and smell musty have a relatively high humidity level. Using a dehumidifier can restore the room to an ideal relative humidity. If the walls feel damp to the touch or have moldy patches, a dehumidifier should be used frequently.